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Among the so-called classical tests of general relativity (GR), light bendinghas been confirmed with an accuracy that increases as times goes by. Here westudy the gravitational deflection of photons within the framework of classicaland semiclassical higher-derivative gravity (HDG) -- the only version of GRthat is known up to now to be renormalizable along with its matter couplings.Since our computations are restricted to scales much below the Planck cut-offwe need not be afraid of the massive spin-2 ghost that haunts HDG. An upperbound on the constant related to the $R^2_{\mu \nu}$-sector of the theory isthen found by analyzing -- from a classical and semiclassical viewpoint -- thedeflection angle of a photon passing by the Sun. This upper limit greatlyimproves that available in the literature.

Classical and tree-level approaches to gravitational deflection in higher-derivative gravity